Granules for low-temperature-resistant anti-ultraviolet plate and preparation method of granules

Abstract

The invention discloses a low-temperature-resistant uvioresistant granule for a plate, which is prepared from the following raw materials in parts by weight: 100 parts of PVC (polyvinyl chloride) resin powder, 4-16 parts of filler, 1-4 parts of stabilizer, 4-8 parts of low-temperature modifier, 4-8 parts of low-temperature impact modifier, 1-3 parts of diisooctyl phenyl phosphate, 0.1-1 part of uvioresistant agent, 0.3-2.1 parts of lubricant, 0-0.1 part of pigment, 1-5 parts of ACR processing aid and 0.1-1 part of antioxidant, the filler comprises rutile type titanium dioxide and active light calcium carbonate; and the lubricant comprises stearic acid, paraffin and PE (Poly Ethylene) wax. The granular material is suitable for production of protection mining area slope protection sheet piles in high-altitude sections in the northwest region, due to the special environment of large day and night temperature difference, long sunshine duration and high ultraviolet intensity in the high-altitude sections, the brittleness problem in a low-temperature environment and the aging problem under strong ultraviolet irradiation are fully considered in the formula, and the granular material can be used under harsh conditions.

Description

Technical Field

[0001] The invention relates to the technical field of PVC materials, and in particular to a low-temperature-resistant and anti-ultraviolet resistant granular material for a plate and a preparation method thereof. Background Art

[0002] A large number of PVC sheets are needed for slope protection in mining areas in plateau regions. Their impact resistance is increased after long-term exposure to high-intensity ultraviolet rays. In addition, the temperature difference between day and night in plateau regions is large. PVC materials will show discoloration, brittleness, cracks, powdering and other photo-oxidation aging phenomena after long-term use in the sun and rain. The low-temperature impact strength and tensile strength of the material will also decrease.

[0003] The invention patent with announcement number CN112026311A and titled "PVC and PC / ASA alloy co-extruded anti-deformation flame-retardant ceiling material and its preparation method" discloses a PVC and PC / ASA alloy co-extruded anti-deformation flame-retardant ceiling material and its preparation method, and its anti-aging idea is also widely adopted in the industry. The board is made of the following raw materials by mass: core layer raw material: 75 parts of PVC resin; 20-60 parts of filler; 3-5 parts of heat stabilizer; 1-3 parts of light stabilizer; 0.5-1 part of antioxidant; 2-5 parts of anti-purple modifier; 0.3-1 part of lubricant; 0.5-2 parts of processing aid; 0-3 parts of pigment; cortex raw material: 10-20 parts of PC / ASA alloy. The product has excellent low temperature resistance, but its impact strength and UV resistance at low temperature are insufficient, and it is not suitable as a material for slope protection and flood control sheet piles in high altitude areas.

[0004] In view of this, it is necessary to develop a hard granular material for PVC pipes suitable for use in plateau areas, which has good low temperature resistance and UV resistance. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a low-temperature resistant anti-ultraviolet plate granular material and a preparation method thereof in view of the deficiencies in the above-mentioned prior art.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: the present invention provides a low temperature resistant anti-ultraviolet plate granular material, which is made of the following raw materials in parts by weight:

[0007] 100 parts of PVC resin powder, 4-16 parts of filler, 1-4 parts of stabilizer, 4-8 parts of low-temperature modifier, 4-8 parts of low-temperature impact agent, 1-3 parts of diisooctyl phenyl phosphate, 0.1-1 part of anti-ultraviolet agent, 0.3-2.1 parts of lubricant, 0-0.1 part of pigment, 1-5 parts of ACR processing aid, 0.1-1 part of antioxidant, wherein the filler at least includes rutile titanium dioxide and active light calcium carbonate, and the mass ratio of the rutile titanium dioxide and the active light calcium carbonate is 1:1-2; the lubricant includes a mixture of one or more of stearic acid, stearate, paraffin, and PE wax.

[0008] Preferably, the lubricant is paraffin, PE wax and stearic acid, wherein the paraffin is 0.1-0.5 parts, the stearic acid is 0.1-1 parts, and the PE wax is 0.1-0.6 parts.

[0009] Preferably, the anti-ultraviolet agent is a chemical ultraviolet absorber.

[0010] Preferably, the low temperature modifier comprises a mixture of 76% to 80% chlorinated polyethylene, 16% to 18% methyl acrylate and 2% to 8% antimony tin oxide.

[0011] Preferably, the low-temperature impact resistant agent comprises a low-temperature acrylic impact resistant agent with a butyl ester component exceeding 40%.

[0012] Preferably, the stabilizer is a calcium zinc stabilizer.

[0013] Preferably, the intrinsic viscosity of the ACR processing aid is 6-7.

[0014] Preferably, the stabilizer comprises an organotin stabilizer.

[0015] A method for preparing low temperature resistant and UV resistant granular material for panels comprises the following steps:

[0016] S1. Mixing powder: Pour stearic acid, active light calcium carbonate and rutile titanium dioxide into a high-speed mixing tank, stir thoroughly and gradually heat to 65-70 ° C, then add PVC resin powder and pigment, and then add stabilizer and diisooctyl phenyl phosphite, anti-ultraviolet agent, antioxidant, stir and heat;

[0017] S2. When the temperature rises to 78-82°C, add low-temperature impact agent and low-temperature modifier, and when the temperature rises to 88-92°C, add paraffin and PE wax;

[0018] S3. Add ACR processing aids when the temperature reaches 134-136℃, mix for a few minutes and then release the material for granulation;

[0019] S4. Granulation: Granulation is carried out using a 65 or 80 conical twin-screw granulator;

[0020] During granulation, the temperature of the granulator is set as follows:

[0021] Zone 1: 165±2℃, Zone 2: 160±2℃, Zone 3: 155±2℃, Zone 4: 150±1℃, Die: 155±1℃.

[0022] Preferably, when the calcium carbonate and titanium dioxide are poured into a high-speed mixing tank for stirring, the rotation speed is not less than 200 r / min and the stirring time is not less than 40 min.

[0023] The beneficial effects of the present invention are:

[0024] The low-temperature resistant and anti-ultraviolet resistant board granular material of the present invention is particularly suitable for the production of slope protection sheet piles for protecting mining areas in high-altitude areas in the northwest region. Due to the special environment of large temperature difference between day and night, long sunshine time and high ultraviolet intensity in high-altitude areas, the formula fully considers the brittleness problem in low-temperature environment and the aging problem under strong ultraviolet irradiation, etc., and can meet the needs of customers under harsh conditions. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0026] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0027] The test methods used in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples are all commercially available unless otherwise specified. In the following examples, if no specific conditions are specified, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0028] A low temperature resistant and UV resistant granular material for panels is made from the following raw materials in parts by weight:

[0029] 100 parts of PVC resin powder (SG-5 powder), 4 parts of rutile titanium dioxide, 6-8 parts of active light calcium carbonate, 2 parts of organic tin stabilizer, 6 parts of low-temperature acrylic ester impact agent with an ester content exceeding 40%, 6 parts of a mixture of 80% chlorinated polyethylene, 17% methyl acrylate and 3% antimony tin oxide as a low-temperature modifier, 1-3 parts of monoisooctyl phenyl phosphate, 0.1-1 parts of UV inhibitor, 0.3 parts of paraffin, 1 part of stearic acid, 0.5 parts of PE wax, 0.1 parts of pigment, ACR with an intrinsic viscosity of 6-7 3 parts of processing aids, 0.5 parts of antioxidants 1010 and 1076 in total, wherein the filler at least includes rutile titanium dioxide and active light calcium carbonate, the mass ratio of the rutile titanium dioxide to the active light calcium carbonate is 1:1-2; the amount of active light calcium carbonate is 1-2 times that of rutile titanium dioxide, and the active light calcium carbonate and stearic acid are fully stirred and combined to ensure the hardness and impact strength of the granules, and the rutile titanium dioxide with a suitable ratio can also make the granules of the present invention have better tensile strength.

[0030] A method for preparing low temperature resistant and UV resistant granular material for panels comprises the following steps:

[0031] S1. Mixing powders: Pour stearic acid, active light calcium carbonate and rutile titanium dioxide into a high-speed mixing tank, stir thoroughly and gradually heat to 70°C, rotate at 200r / min, and stir for 40min. Then add PVC resin powder and pigment, and then add stabilizer, diisooctyl phenyl phosphite, anti-ultraviolet agent, and antioxidant in turn and stir;

[0032] S2. When the temperature rises to 80°C, add low-temperature impact agent and low-temperature modifier, and when the temperature rises to 90°C, add paraffin and PE wax;

[0033] S3. Add ACR processing aids when the temperature reaches 135℃, mix for a few minutes and then release the material for granulation;

[0034] S4. Granulation: Granulation is carried out using an 80 conical twin-screw granulator;

[0035] During granulation, the temperature of the granulator is set as follows:

[0036] Zone 1: 165℃, Zone 2: 160℃, Zone 3: 155℃, Zone 4: 150℃, Die: 155℃.

[0037] Within this component ratio range and granulation method, various prepared tube granules were tested, and the parameter statistics are as follows:

[0038]

[0039] The low-temperature modifier is a mixture of chlorinated polyethylene and methyl acrylate, and antimony tin oxide is added to enhance the anti-ultraviolet and near-infrared performance. At the same time, compared with the low-temperature modifier without antimony tin oxide (80% chlorinated polyethylene and 20% methyl acrylate), the simply supported beam notched impact strength (-25℃*4h) of the pellets prepared by adding more than 3% of the low-temperature modifier with antimony tin oxide can be increased by 0.2% to 0.4% after low-temperature freezing.

[0040] In addition, due to the difference in the microstructure of titanium dioxide and calcium carbonate, the shape of rutile titanium dioxide particles is relatively regular, while the shape of active light calcium carbonate particles is more irregular. The particles rub against each other during stirring. Sufficient stirring allows titanium dioxide and calcium carbonate to be better mixed, and the shape of the calcium carbonate particles is rubbed to more adaptably enter the gaps between the filler particles, so that the arrangement of titanium dioxide and calcium carbonate particles in the filler is optimized and more dense. In addition, since stearic acid is added for lubrication during stirring, after gradual heating to 70°C, the additional heat generated by the friction between the particles causes the stearic acid to be melted and adsorbed on the surface. As stirring proceeds, the stearic acid and active light calcium carbonate particles are fully combined, and the active light calcium carbonate particles perform better in improving the tensile strength and impact strength of the material. For example, when other processing conditions are the same, the filler in step S1 is directly heated to 70°C, and the hardness of the granules prepared after only 10 minutes of stirring and mixing time is not much changed compared with that prepared after 40 minutes of stirring and mixing time, but the impact strength and tensile strength at room temperature are more than 0.1% weaker; in addition, when other processing conditions are the same, if the stearic acid added in step S1 is added together with paraffin and PE wax in step S2, the granules prepared are more than 0.2% weaker in impact strength and tensile strength at room temperature than the granules of the present invention; therefore, it is preferred that when the calcium carbonate and titanium dioxide are poured into a high-speed mixing tank for stirring, the rotation speed is not less than 200r / min, and the stirring time is not less than 40min.

[0041] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. A low temperature resistant and UV resistant granular material for panels, characterized in that: Made from the following raw materials in parts by weight: 100 parts of PVC resin powder, 4-16 parts of filler, 1-4 parts of stabilizer, 4-8 parts of low-temperature modifier, 4-8 parts of low-temperature impact agent, 1-3 parts of diisooctyl phenyl phosphate, 0.1-1 part of anti-ultraviolet agent, 0.3-2.1 parts of lubricant, 0-0.1 part of pigment, 1-5 parts of ACR processing aid, 0.1-1 part of antioxidant, wherein the filler at least includes rutile titanium dioxide and active light calcium carbonate, and the mass ratio of the rutile titanium dioxide and the active light calcium carbonate is 1:1-2; the lubricant includes a mixture of one or more of stearic acid, stearate, paraffin, and PE wax.

2. The low temperature resistant and UV resistant plate granular material according to claim 1, characterized in that: The lubricant is paraffin wax, PE wax and stearic acid, wherein the paraffin wax is 0.1 to 0.5 parts, the stearic acid is 0.1 to 1 parts, and the PE wax is 0.1 to 0.6 parts.

3. The low temperature resistant and UV resistant plate granular material according to claim 1, characterized in that: The anti-ultraviolet agent adopts a chemical ultraviolet absorber.

4. The low temperature resistant and UV resistant plate granular material according to claim 1, characterized in that: The low-temperature modifier comprises a mixture of 76% to 80% of chlorinated polyethylene, 16% to 18% of methyl acrylate and 2% to 8% of antimony tin oxide.

5. The low temperature resistant and UV resistant plate granular material according to claim 1, characterized in that: The low-temperature impact-resistant agent comprises a low-temperature acrylic ester impact-resistant agent with a butyl ester component exceeding 40%.

6. The low temperature resistant and UV resistant plate granular material according to claim 5, characterized in that: The stabilizer is a calcium zinc stabilizer.

7. The low temperature resistant and UV resistant plate granular material according to claim 1, characterized in that: The intrinsic viscosity of the ACR processing aid is 6-7.

8. The low temperature resistant and UV resistant plate granular material according to claim 1, characterized in that: The stabilizer includes an organotin stabilizer.

9. A method for preparing the low temperature resistant and UV resistant plate granules according to claim 1, characterized in that: The steps include: A method for preparing low temperature resistant and UV resistant granular material for panels comprises the following steps: S1. Mixing powder: Pour stearic acid, active light calcium carbonate and rutile titanium dioxide into a high-speed mixing tank, stir thoroughly and gradually heat to 65-70 ° C, then add PVC resin powder and pigment, and then add stabilizer and diisooctyl phenyl phosphite, anti-ultraviolet agent, antioxidant, stir and heat; S2. When the temperature rises to 78-82°C, add low-temperature impact agent and low-temperature modifier, and when the temperature rises to 88-92°C, add paraffin and PE wax; S3. Add ACR processing aids when the temperature reaches 134-136℃, mix for a few minutes and then release the material for granulation; S4. Granulation: Granulation is carried out using a 65 or 80 conical twin-screw granulator; During granulation, the temperature of the granulator is set as follows: Zone 1: 165±2℃, Zone 2: 160±2℃, Zone 3: 155±2℃, Zone 4: 150±1℃, Die: 155±1℃.

10. The method for preparing the low temperature resistant and UV resistant granular material for boards according to claim 9, characterized in that: When the calcium carbonate and titanium dioxide are poured into a high-speed mixing tank for stirring, the rotation speed is not less than 200 r / min and the stirring time is not less than 40 min.

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